Techniques for updating transmission configuration indicator states

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a serving cell (e.g., serving base station), an indication to update a transmission configuration indicator (TCI) state of a first component carrier associated with a neighboring cell (e.g., neighboring base station). In some cases, the UE may be configured with a serving cell update rule and a neighboring cell update rule. The UE may determine, in accordance with a neighboring cell update rule, whether to update the TCI state across multiple component carriers (e.g., in a component carrier list) associated with the first component carrier based on the first component carrier being associated with the neighboring cell. The UE may update the TCI state of at least the first component carrier in accordance with the neighboring cell update rule.

What is claimed is: 
     
       1. A method for wireless communications at a user equipment (UE), comprising:
 receiving, from a serving cell, an indication to update a transmission configuration indicator state of a first component carrier associated with a neighboring cell, wherein the transmission configuration indicator state is updated differently depending on whether the transmission configuration indicator state is associated with one of: a first reference signal associated with the serving cell and a second reference signal associated with the neighboring cell; 
 determining, in accordance with a neighboring cell update rule, whether to update the transmission configuration indicator state across multiple component carriers associated with the first component carrier based at least in part on the first component carrier being associated with the neighboring cell; and 
 updating the transmission configuration indicator state of at least the first component carrier in accordance with the neighboring cell update rule. 
 
     
     
       2. The method of  claim 1 , wherein updating the transmission configuration indicator state further comprises:
 updating the transmission configuration indicator state across the first component carrier and the multiple component carriers in accordance with the neighboring cell update rule and based at least in part on the first component carrier and each component carrier of the multiple component carriers being included in a component carrier list, wherein the neighboring cell update rule supports updating of the transmission configuration indicator state across the multiple component carriers. 
 
     
     
       3. The method of  claim 1 , wherein updating the transmission configuration indicator state further comprises:
 updating the transmission configuration indicator state across the first component carrier only in accordance with the neighboring cell update rule, wherein the neighboring cell update rule supports updating of the transmission configuration indicator state for only the first component carrier despite the first component carrier and component carriers of the multiple component carriers being included in a component carrier list. 
 
     
     
       4. The method of  claim 1 , further comprising:
 receiving the neighboring cell update rule via a bit indication in a radio resource control message. 
 
     
     
       5. The method of  claim 1 , further comprising:
 receiving an indication of the neighboring cell update rule and the indication to update the transmission configuration indicator state in a same message, the same message being a radio resource control message, a medium access control element message, or a downlink control information message. 
 
     
     
       6. The method of  claim 1 , further comprising:
 receiving a message that indicates that the UE is to update a plurality of transmission configuration indicator states; and 
 receiving one or more indications of a plurality of neighboring cell update rules, each neighboring cell update rule of the plurality of neighboring cell update rules associated with one of the plurality of transmission configuration indicator states being updated, wherein the UE updates the plurality of transmission configuration indicator states across one or more component carriers in accordance with the associated neighboring cell update rule. 
 
     
     
       7. The method of  claim 1 , further comprising:
 determining whether the transmission configuration indicator state is associated with the neighboring cell or the serving cell based at least in part on a quasi co-location chain, wherein determining whether to update the transmission configuration indicator state across the multiple component carriers is based at least in part on whether the transmission configuration indicator state is associated with the neighboring cell or the serving cell. 
 
     
     
       8. The method of  claim 1 , wherein determining whether to update the transmission configuration indicator state across the multiple component carriers further comprises:
 determining to update the transmission configuration indicator state of the first component carrier and to refrain from updating the transmission configuration indicator state across the multiple component carriers in accordance with the neighboring cell update rule and based at least in part on the first component carrier being associated with the neighboring cell. 
 
     
     
       9. The method of  claim 1 , wherein the transmission configuration indicator state is included in a pool of transmission configuration indicator states, the pool of transmission configuration indicator states associated with the first component carrier, updating the transmission configuration indicator state further comprises:
 updating the transmission configuration indicator state across the first component carrier only based at least in part on the pool of transmission configuration indicator states being associated with the first component carrier. 
 
     
     
       10. The method of  claim 1 , wherein the transmission configuration indicator state is included in a pool of transmission configuration indicator states, the pool of transmission configuration indicator states associated with the first component carrier and the multiple component carriers, updating the transmission configuration indicator state further comprises:
 updating the transmission configuration indicator state across the first component carrier and the multiple component carriers based at least in part on the pool of transmission configuration indicator states being associated with the first component carrier and the multiple component carriers. 
 
     
     
       11. The method of  claim 1 , further comprising:
 receiving a message indicating a bandwidth part identifier, the bandwidth part identifier associated with a bandwidth part included in the first component carrier; and 
 determining that the transmission configuration indicator state is associated with the neighboring cell based at least in part on the bandwidth part identifier. 
 
     
     
       12. The method of  claim 11 , wherein updating the transmission configuration indicator state further comprises:
 updating the transmission configuration indicator state across the bandwidth part associated with the bandwidth part identifier in accordance with the neighboring cell update rule. 
 
     
     
       13. The method of  claim 11 , further comprising:
 determining one or more parameters associated with the neighboring cell based at least in part on the bandwidth part identifier. 
 
     
     
       14. A method for wireless communications at a base station, comprising:
 transmitting, to a user equipment (UE), an indication to update a transmission configuration indicator state of a first component carrier associated with a neighboring cell, wherein the transmission configuration indicator state is updated differently depending on whether the transmission configuration indicator state is associated with one of: a first reference signal associated with a serving cell and a second reference signal associated with the neighboring cell; and 
 transmitting a message comprising a neighboring cell update rule for updating the transmission configuration indicator state across multiple component carriers associated with the first component carrier. 
 
     
     
       15. The method of  claim 14 , wherein transmitting the message comprising the neighboring cell update rule further comprises:
 transmitting a radio resource control message comprising a bit, the bit indicating the neighboring cell update rule. 
 
     
     
       16. The method of  claim 14 , wherein the message comprising the neighboring cell update rule and the indication to update the transmission configuration indicator state are included in a same message, the same message being a radio resource control message, a medium access control element message, or a downlink control information message. 
     
     
       17. The method of  claim 14 , further comprising:
 transmitting a second message indicating the UE to update a plurality of transmission configuration indicator states; and 
 transmitting a plurality of neighboring cell update rules, each neighboring cell update rule of the plurality of neighboring cell update rules associated with one of the plurality of transmission configuration indicator states being updated. 
 
     
     
       18. The method of  claim 14 , wherein the neighboring cell update rule supports updating, by the UE, of the transmission configuration indicator state across the multiple component carriers. 
     
     
       19. The method of  claim 14 , wherein the neighboring cell update rule supports updating, by the UE, of the transmission configuration indicator state across the first component carrier only. 
     
     
       20. An apparatus for wireless communications at a user equipment (UE), comprising:
 a processor; 
 memory coupled with the processor; and 
 instructions stored in the memory and executable by the processor to cause the apparatus to:
 receive, from a serving cell, an indication to update a transmission configuration indicator state of a first component carrier associated with a neighboring cell, wherein the transmission configuration indicator state is updated differently depending on whether the transmission configuration indicator state is associated with one of: a first reference signal associated with the serving cell and a second reference signal associated with the neighboring cell; 
 determine, in accordance with a neighboring cell update rule, whether to update the transmission configuration indicator state across multiple component carriers associated with the first component carrier based at least in part on the first component carrier being associated with the neighboring cell; and 
 update the transmission configuration indicator state of at least the first component carrier in accordance with the neighboring cell update rule. 
 
 
     
     
       21. The apparatus of  claim 20 , wherein the instructions to update the transmission configuration indicator state are further executable by the processor to cause the apparatus to update the transmission configuration indicator state across the first component carrier and the multiple component carriers in accordance with the neighboring cell update rule and based at least in part on the first component carrier and each component carrier of the multiple component carriers being included in a component carrier list, wherein the neighboring cell update rule supports updating of the transmission configuration indicator state across the multiple component carriers. 
     
     
       22. The apparatus of  claim 20 , wherein the instructions to update the transmission configuration indicator state are further executable by the processor to cause the apparatus to update the transmission configuration indicator state across the first component carrier only in accordance with the neighboring cell update rule, wherein the neighboring cell update rule supports updating of the transmission configuration indicator state for only the first component carrier despite the first component carrier and component carriers of the multiple component carriers being included in a component carrier list. 
     
     
       23. The apparatus of  claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
 receive the neighboring cell update rule via a bit indication in a radio resource control message. 
 
     
     
       24. The apparatus of  claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
 receive an indication of the neighboring cell update rule and the indication to update the transmission configuration indicator state in a same message, the same message being a radio resource control message, a medium access control element message, or a downlink control information message. 
 
     
     
       25. The apparatus of  claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
 receive a message that indicates that the UE is to update a plurality of transmission configuration indicator states; and 
 receive one or more indications of a plurality of neighboring cell update rules, each neighboring cell update rule of the plurality of neighboring cell update rules associated with one of the plurality of transmission configuration indicator states being updated, wherein the UE updates the plurality of transmission configuration indicator states across one or more component carriers in accordance with the associated neighboring cell update rule. 
 
     
     
       26. The apparatus of  claim 20 , wherein the instructions are further executable by the processor to cause the apparatus to:
 determine whether the transmission configuration indicator state is associated with the neighboring cell or the serving cell based at least in part on a quasi co-location chain, wherein determining whether to update the transmission configuration indicator state across the multiple component carriers is based at least in part on whether the transmission configuration indicator state is associated with the neighboring cell or the serving cell. 
 
     
     
       27. An apparatus for wireless communications at a base station, comprising:
 a processor; 
 memory coupled with the processor; and 
 instructions stored in the memory and executable by the processor to cause the apparatus to:
 transmit, to a user equipment (UE), an indication to update a transmission configuration indicator state of a first component carrier associated with a neighboring cell, wherein the transmission configuration indicator state is updated differently depending on whether the transmission configuration indicator state is associated with one of: a first reference signal associated with a serving cell and a second reference signal associated with the neighboring cell; and 
 transmit a message comprising a neighboring cell update rule for updating the transmission configuration indicator state across multiple component carriers associated with the first component carrier. 
 
 
     
     
       28. The apparatus of  claim 27 , wherein the instructions to transmit the message comprising the neighboring cell update rule are further executable by the processor to cause the apparatus to transmit a radio resource control message comprising a bit, the bit indicating the neighboring cell update rule. 
     
     
       29. The apparatus of  claim 27 , wherein the message comprising the neighboring cell update rule and the indication to update the transmission configuration indicator state are included in a same message, the same message being a radio resource control message, a medium access control element message, or a downlink control information message. 
     
     
       30. The apparatus of  claim 27 , wherein the instructions are further executable by the processor to cause the apparatus to:
 transmit a second message indicating the UE to update a plurality of transmission configuration indicator states; and 
 transmit a plurality of neighboring cell update rules, each neighboring cell update rule of the plurality of neighboring cell update rules associated with one of the plurality of transmission configuration indicator states being updated.